1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Time grids for months and weeks</title> 5<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../index.html" title="Chapter 1. Boost.Icl"> 8<link rel="up" href="../examples.html" title="Examples"> 9<link rel="prev" href="partys_tallest_guests.html" title="Party's tallest guests"> 10<link rel="next" href="man_power.html" title="Man power"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="partys_tallest_guests.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../examples.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="man_power.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h3 class="title"> 27<a name="boost_icl.examples.time_grids"></a><a class="link" href="time_grids.html" title="Time grids for months and weeks">Time grids for months 28 and weeks</a> 29</h3></div></div></div> 30<p> 31 A <code class="computeroutput"><a class="link" href="../../boost/icl/split_interval_set.html" title="Class template split_interval_set">split_interval_set</a></code> 32 preserves all interval borders on insertion and intersection operations. 33 So given a <code class="computeroutput"><a class="link" href="../../boost/icl/split_interval_set.html" title="Class template split_interval_set">split_interval_set</a></code> 34 and an addition of an interval 35</p> 36<pre class="programlisting"><span class="identifier">x</span> <span class="special">=</span> <span class="special">{[</span><span class="number">1</span><span class="special">,</span> <span class="number">3</span><span class="special">)}</span> 37<span class="identifier">x</span><span class="special">.</span><span class="identifier">add</span><span class="special">(</span> <span class="special">[</span><span class="number">2</span><span class="special">,</span> <span class="number">4</span><span class="special">))</span> 38</pre> 39<p> 40 then the intervals are split at their borders 41</p> 42<pre class="programlisting"><span class="identifier">x</span> <span class="special">==</span> <span class="special">{[</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">)[</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">)[</span><span class="number">3</span><span class="special">,</span><span class="number">4</span><span class="special">)}</span> 43</pre> 44<p> 45 Using this property we can intersect <code class="computeroutput"><a class="link" href="../../boost/icl/split_interval_map.html" title="Class template split_interval_map">split_interval_maps</a></code> 46 in order to iterate over intervals accounting for all occurring changes of 47 interval borders. 48 </p> 49<p> 50 In this example we provide an intersection of two <code class="computeroutput"><a class="link" href="../../boost/icl/split_interval_set.html" title="Class template split_interval_set">split_interval_sets</a></code> 51 representing a month and week time grid. 52 </p> 53<p> 54</p> 55<pre class="programlisting"><span class="comment">// The next line includes <boost/gregorian/date.hpp></span> 56<span class="comment">// and a few lines of adapter code.</span> 57<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">icl</span><span class="special">/</span><span class="identifier">gregorian</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 58<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> 59<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">icl</span><span class="special">/</span><span class="identifier">split_interval_set</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 60 61<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">std</span><span class="special">;</span> 62<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">;</span> 63<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">icl</span><span class="special">;</span> 64 65<span class="keyword">typedef</span> <span class="identifier">split_interval_set</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">::</span><span class="identifier">date</span><span class="special">></span> <span class="identifier">date_grid</span><span class="special">;</span> 66 67<span class="comment">// This function splits a gregorian::date interval 'scope' into a month grid:</span> 68<span class="comment">// For every month contained in 'scope' that month is contained as interval</span> 69<span class="comment">// in the resulting split_interval_set.</span> 70<span class="identifier">date_grid</span> <span class="identifier">month_grid</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">date</span><span class="special">>&</span> <span class="identifier">scope</span><span class="special">)</span> 71<span class="special">{</span> 72 <span class="identifier">split_interval_set</span><span class="special"><</span><span class="identifier">date</span><span class="special">></span> <span class="identifier">month_grid</span><span class="special">;</span> 73 74 <span class="identifier">date</span> <span class="identifier">frame_months_1st</span> <span class="special">=</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">scope</span><span class="special">).</span><span class="identifier">end_of_month</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">days</span><span class="special">(</span><span class="number">1</span><span class="special">)</span> <span class="special">-</span> <span class="identifier">months</span><span class="special">(</span><span class="number">1</span><span class="special">);</span> 75 <span class="identifier">month_iterator</span> <span class="identifier">month_iter</span><span class="special">(</span><span class="identifier">frame_months_1st</span><span class="special">);</span> 76 77 <span class="keyword">for</span><span class="special">(;</span> <span class="identifier">month_iter</span> <span class="special"><=</span> <span class="identifier">last</span><span class="special">(</span><span class="identifier">scope</span><span class="special">);</span> <span class="special">++</span><span class="identifier">month_iter</span><span class="special">)</span> 78 <span class="identifier">month_grid</span> <span class="special">+=</span> <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">date</span><span class="special">>::</span><span class="identifier">right_open</span><span class="special">(*</span><span class="identifier">month_iter</span><span class="special">,</span> <span class="special">*</span><span class="identifier">month_iter</span> <span class="special">+</span> <span class="identifier">months</span><span class="special">(</span><span class="number">1</span><span class="special">));</span> 79 80 <span class="identifier">month_grid</span> <span class="special">&=</span> <span class="identifier">scope</span><span class="special">;</span> <span class="comment">// cut off the surplus</span> 81 82 <span class="keyword">return</span> <span class="identifier">month_grid</span><span class="special">;</span> 83<span class="special">}</span> 84 85<span class="comment">// This function splits a gregorian::date interval 'scope' into a week grid:</span> 86<span class="comment">// For every week contained in 'scope' that month is contained as interval</span> 87<span class="comment">// in the resulting split_interval_set.</span> 88<span class="identifier">date_grid</span> <span class="identifier">week_grid</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">date</span><span class="special">>&</span> <span class="identifier">scope</span><span class="special">)</span> 89<span class="special">{</span> 90 <span class="identifier">split_interval_set</span><span class="special"><</span><span class="identifier">date</span><span class="special">></span> <span class="identifier">week_grid</span><span class="special">;</span> 91 92 <span class="identifier">date</span> <span class="identifier">frame_weeks_1st</span> <span class="special">=</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">scope</span><span class="special">)</span> <span class="special">+</span> <span class="identifier">days</span><span class="special">(</span><span class="identifier">days_until_weekday</span><span class="special">(</span><span class="identifier">first</span><span class="special">(</span><span class="identifier">scope</span><span class="special">),</span> <span class="identifier">greg_weekday</span><span class="special">(</span><span class="identifier">Monday</span><span class="special">)))</span> <span class="special">-</span> <span class="identifier">weeks</span><span class="special">(</span><span class="number">1</span><span class="special">);</span> 93 <span class="identifier">week_iterator</span> <span class="identifier">week_iter</span><span class="special">(</span><span class="identifier">frame_weeks_1st</span><span class="special">);</span> 94 95 <span class="keyword">for</span><span class="special">(;</span> <span class="identifier">week_iter</span> <span class="special"><=</span> <span class="identifier">last</span><span class="special">(</span><span class="identifier">scope</span><span class="special">);</span> <span class="special">++</span><span class="identifier">week_iter</span><span class="special">)</span> 96 <span class="identifier">week_grid</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">date</span><span class="special">>::</span><span class="identifier">right_open</span><span class="special">(*</span><span class="identifier">week_iter</span><span class="special">,</span> <span class="special">*</span><span class="identifier">week_iter</span> <span class="special">+</span> <span class="identifier">weeks</span><span class="special">(</span><span class="number">1</span><span class="special">)));</span> 97 98 <span class="identifier">week_grid</span> <span class="special">&=</span> <span class="identifier">scope</span><span class="special">;</span> <span class="comment">// cut off the surplus</span> 99 100 <span class="keyword">return</span> <span class="identifier">week_grid</span><span class="special">;</span> 101<span class="special">}</span> 102 103<span class="comment">// For a period of two months, starting from today, the function</span> 104<span class="comment">// computes a partitioning for months and weeks using intersection</span> 105<span class="comment">// operator &= on split_interval_sets.</span> 106<span class="keyword">void</span> <span class="identifier">month_and_time_grid</span><span class="special">()</span> 107<span class="special">{</span> 108 <span class="identifier">date</span> <span class="identifier">someday</span> <span class="special">=</span> <span class="identifier">day_clock</span><span class="special">::</span><span class="identifier">local_day</span><span class="special">();</span> 109 <span class="identifier">date</span> <span class="identifier">thenday</span> <span class="special">=</span> <span class="identifier">someday</span> <span class="special">+</span> <span class="identifier">months</span><span class="special">(</span><span class="number">2</span><span class="special">);</span> 110 111 <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">date</span><span class="special">></span> <span class="identifier">itv</span> <span class="special">=</span> <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">date</span><span class="special">>::</span><span class="identifier">right_open</span><span class="special">(</span><span class="identifier">someday</span><span class="special">,</span> <span class="identifier">thenday</span><span class="special">);</span> 112 113 <span class="comment">// Compute a month grid</span> 114 <span class="identifier">date_grid</span> <span class="identifier">month_and_week_grid</span> <span class="special">=</span> <span class="identifier">month_grid</span><span class="special">(</span><span class="identifier">itv</span><span class="special">);</span> 115 <span class="comment">// Intersection of the month and week grids:</span> 116 <span class="identifier">month_and_week_grid</span> <span class="special">&=</span> <span class="identifier">week_grid</span><span class="special">(</span><span class="identifier">itv</span><span class="special">);</span> 117 118 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"interval : "</span> <span class="special"><<</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">itv</span><span class="special">)</span> <span class="special"><<</span> <span class="string">" - "</span> <span class="special"><<</span> <span class="identifier">last</span><span class="special">(</span><span class="identifier">itv</span><span class="special">)</span> 119 <span class="special"><<</span> <span class="string">" month and week partitions:"</span> <span class="special"><<</span> <span class="identifier">endl</span><span class="special">;</span> 120 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"---------------------------------------------------------------\n"</span><span class="special">;</span> 121 122 <span class="keyword">for</span><span class="special">(</span><span class="identifier">date_grid</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">it</span> <span class="special">=</span> <span class="identifier">month_and_week_grid</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> 123 <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">month_and_week_grid</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> <span class="identifier">it</span><span class="special">++)</span> 124 <span class="special">{</span> 125 <span class="keyword">if</span><span class="special">(</span><span class="identifier">first</span><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">day</span><span class="special">()</span> <span class="special">==</span> <span class="number">1</span><span class="special">)</span> 126 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"new month: "</span><span class="special">;</span> 127 <span class="keyword">else</span> <span class="keyword">if</span><span class="special">(</span><span class="identifier">first</span><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">day_of_week</span><span class="special">()==</span><span class="identifier">greg_weekday</span><span class="special">(</span><span class="identifier">Monday</span><span class="special">))</span> 128 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"new week : "</span> <span class="special">;</span> 129 <span class="keyword">else</span> <span class="keyword">if</span><span class="special">(</span><span class="identifier">it</span> <span class="special">==</span> <span class="identifier">month_and_week_grid</span><span class="special">.</span><span class="identifier">begin</span><span class="special">())</span> 130 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"first day: "</span> <span class="special">;</span> 131 <span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">first</span><span class="special">(*</span><span class="identifier">it</span><span class="special">)</span> <span class="special"><<</span> <span class="string">" - "</span> <span class="special"><<</span> <span class="identifier">last</span><span class="special">(*</span><span class="identifier">it</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">endl</span><span class="special">;</span> 132 <span class="special">}</span> 133<span class="special">}</span> 134 135 136<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> 137<span class="special">{</span> 138 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">">>Interval Container Library: Sample month_and_time_grid.cpp <<\n"</span><span class="special">;</span> 139 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"---------------------------------------------------------------\n"</span><span class="special">;</span> 140 <span class="identifier">month_and_time_grid</span><span class="special">();</span> 141 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 142<span class="special">}</span> 143 144<span class="comment">// Program output:</span> 145<span class="comment">/* 146>>Interval Container Library: Sample month_and_time_grid.cpp << 147--------------------------------------------------------------- 148interval : 2008-Jun-22 - 2008-Aug-21 month and week partitions: 149--------------------------------------------------------------- 150first day: 2008-Jun-22 - 2008-Jun-22 151new week : 2008-Jun-23 - 2008-Jun-29 152new week : 2008-Jun-30 - 2008-Jun-30 153new month: 2008-Jul-01 - 2008-Jul-06 154new week : 2008-Jul-07 - 2008-Jul-13 155new week : 2008-Jul-14 - 2008-Jul-20 156new week : 2008-Jul-21 - 2008-Jul-27 157new week : 2008-Jul-28 - 2008-Jul-31 158new month: 2008-Aug-01 - 2008-Aug-03 159new week : 2008-Aug-04 - 2008-Aug-10 160new week : 2008-Aug-11 - 2008-Aug-17 161new week : 2008-Aug-18 - 2008-Aug-21 162*/</span> 163</pre> 164<p> 165 </p> 166</div> 167<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 168<td align="left"></td> 169<td align="right"><div class="copyright-footer">Copyright © 2007-2010 Joachim 170 Faulhaber<br>Copyright © 1999-2006 Cortex Software 171 GmbH<p> 172 Distributed under the Boost Software License, Version 1.0. (See accompanying 173 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 174 </p> 175</div></td> 176</tr></table> 177<hr> 178<div class="spirit-nav"> 179<a accesskey="p" href="partys_tallest_guests.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../examples.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="man_power.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 180</div> 181</body> 182</html> 183
